Mechanical Ventilation Year in Review
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- Berniece Morgan
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1 Mechanical Ventilation Year in Review Bruce P. Krieger, MD, FACP, FCCP Clinical Professor of Medicine (courtesy) University of Florida - Jacksonville Professor of Medicine (vol) University of Miami Medical Director Critical Care Center Memorial Hospital Jacksonville I have no conflicts of interest to disclose, just interesting conflicts
2 Methods Mechanical Ventilation - Methodology Year in Review Online and manual search of relevant journals 134 articles concerning aspects of MVS screened Criteria for inclusion Clinical, adult human studies Clinically relevant Either: novel, controversial, confirmatory, pragmatic, cute Grading system what I thought would be of interest Reviewed rigorous studies, smaller journals, debates, editorials Review included the popular articles from major journals
3 MVS Alphabet BiPAP CPAP CMV AC SIMV PC-IRV VC-IRV PCV VCV PAV VSV PSV MMV HFOV Prone APRV
4 Historically, which was the first method to provide effective positive pressure? a) volume - controlled ventilation b) pressure - controlled ventilation c) time -cycled ventilation d) CPAP via mask e) iron lung (the Drinker ventilator)
5 Use of NIPPV in Acute Respiratory Failure Population Study Walkey AJ & Wiener RS. Ann Am Thorac Soc 2013;10:10-17 Nationwide Inpatient Sample 11,659,668 pts ~1,000 hospitals (~20% of all pts in US)-billing data (400% increase) (250% increase)
6 Use of NIPPV in Acute Respiratory Failure Population Study Walkey AJ & Wiener RS. Ann Am Thorac Soc 2013;10:10-17 NIPPV failure higher in non-copd pts (p<0.001) Etiology COPD (n=409,062) Odds Ratio (95% CI) Reference Sepsis (n=12,962) 1.07 ( ) Heart failure (n=153,489) 1.08 ( ) Asthma (n=24,438) 1.18 ( ) Pneumonia (n=78,162) 1.70 ( ) Neuro Dx (n=9,075) 0.95 ( ) Failed NIPPV had HIGHER hosp mortality vs ETT Odds Ratio = 1.14 ( ; p < 0.001) First Do No Harm
7 Disease Categories Treated with NIPPV Obstructive lung disease COPD, upper airway obstruction Asthma, cystic fibrosis Acute cardiogenic pulmonary edema Restrictive lung diseases Chest wall deformities, muscular dystrophies Obesity Hypoventilation Syndrome (OHS) Do-not-intubate situations Hypoxemic respiratory failure ARDS, trauma, post-operative Immunocompromised host Pneumonia Hill, Nicholas, Editor.NIPPV:Principles & Applications. Armonk, NY; Futura,2001 Hill Nicholas. J Crit Illness 2001;16:361-66
8 NIPPV in Acute Hypercarbic OHS vs COPD (PaCO2 = 84 vs 86; ph=7.22 vs 7.22) Carillo A, Torres A, et al. AJRCCM 2012; 186: Spanish Study of NIPPV 1/97-12/10, n = 3,075 used NIPPV 173 (6%) had OHS 543 (18%) had COPD 184 had co-existing OHS Success rate (BiPAP 12/5 initial) No ETT, better ABG Alive & conscious > 24 hrs after ICU discharge OHS 94%; COPD 89% P = 0.11 Conclusion OK to use NIPPV for acute hypercarbic OHS exacerbations
9 Weaning or Liberation Wean to accustom to loss of mother s milk get along without some special comfort or object of desire Liberate to free from domination; unload; unshackle; unburden; disencumber; disentangle; deoppilate Working Definition Transition from mechanical support to stable spontaneous breathing
10 Weaning Is Weaning an Art or a Science? often making a mountain out of a molehill Most patients (80%) do not need to be weaned Most weaning failures are the clinician s failure to predict an imbalance between supply and demand J Milic-Emili. Am Rev Respir Dis 1986;134:1607
11 Weaning Strategies It s about time Wait until Monday Recovery room wean Sink or swim Untie their hands OOPS
12 The Weaning Index (WI) In Search of the Holy Grail of Weaning Huaringa AJ et al. J Intensive Care Med 2013; 28: WI = RSBI x EI x VDI (threshold < 101) EI elastance index = PIP/P I max (threshold < 1) PIP determined with Vt = 8 ml/kg VDI = ventilatory demand index = Ve/10 (threshold< 1) Ve while fully controlled on AC; idea based on Sahn 1973 RSBI (f/vt) while on CPAP 0 & PS 0 for one minute Single institution study; n = 59 ARDS (17), PNA (13), COPD (9), ICH (6), pancreatitis (3)
13 The Weaning Index (WI) In Search of the Holy Grail of Weaning Huaringa AJ et al. J Intensive Care Med 2013; 28: Weaning protocol Screening trial x 10 min on SIMV 10, PEEP 5, PS 10 If RR < 25, changed to CPAP 0 & PS 0 RSBI while on CPAP 0 & PS 0 for one min If RSBI < or = 105, patient extubated Results Success Failure WI < or = WI > Sensitivity 40/41 = PPV = 40/42 = 0.95 Specificity 16/18 = 0.89 NPV = 16/17 = 0.94 Diagnostic Accuracy = 95.9%
14 The Weaning Index (WI) In Search of the Holy Grail of Weaning Huaringa AJ et al. J Intensive Care Med 2013; 28: Study Test Sensitivity Specificity PPV NPV Yang & Tobin (1991) Jabous, et al (1991) Sassoon, et al (1993) Nemer et al (2006) f/vt PTI x Ve -40/ Vt spont P 0.1 x f/vt [C st ][SaO2/RSBI] Present study (2013) WI Pti=pressure-time index; Ve -40 (Ve required for PaCO2=40); Vt spont = spontaneous Vt Conclusions: more specific that RSBI; easier than using P 0.1 or PTI faster than a spontaneous breathing trial..but
15 Inspiratory Muscle Training Did Not Accelerate Weaning from MVS Condessa RL, et al. J Physiotherapy 2013;59: (Porto Alegre, Brazil) Methods Inspiratory loading device set at 40% MIP 5 sets x 10 breaths bid; clinicians blinded to intervention Results Experimental (n=45) Control (n=47) Age (yrs) Apache II GCS *p < 0.05) MIP change* 7-3 Vt change (ml)* RSBI Duration MV (hrs) Weaning (hrs) 53 61
16 Comparison of Weaning Methods Prospective, Randomized with in Each Group Method Days to Weaned Reintubated >13 days Wean of MVS SIMV 5 69% 14% 17% PSV 4 62% 19% 11% OneDaily SB Trial Multiple SB Trials 3 71% 23% 3% 3 82% 15% 3% Esteban, Frutos, Tobin et al. NEJM 1995;332:345-50
17 Automated Weaning with Closed Loop Systems Cochrane Analysis Rose L, et al. Cochrane Database of Systematic Reviews 2013 Jun6;6:CD Pooled data from 15 trials (1143 adults, 30 kids) Weaning duration decreased 32% (CI 19-46, p=0.002) However, heterogeneity substantial Significant only for mixed or MICU populations, not SICU Significant for Smartcare/PS system only (p=0.02) MVS duration reduced 17% (CI 8-26, p<0.05) ICU LOS reduced 11% (CI 0-21, p < 0.05) Mortality & Hospital LOS not significantly improved Need multi-center randomized controlled trials
18 Wean Earlier & Automatically Canadian Study, 9 ICU s Burns KE et al. AJRCCM 2013;187: Automatic Wean N = 49 Protocolized Wean N = 43 p value Baseline characteristics Age, Dx, etc MVS days prior >0.13 Time to 1 st successful SBT (d)* < Duration of MVS (days) Time to successful extubation (d)* ICU mortality 18.4% 20.4% 0.8 Hospital mortality % 0.9 Re-intubation 18.8% 25.6% 0.4 Automated Weaning via SmartCare (Evita, Draeger) - adjusts PS via f, Vt, and PetCO2 Protocolized Weaning via written protocol for RTs - q 4-6 hr evaluations to adjust PS (24 hr/day)
19 Wean Earlier & Automatically Burns KE et al. AJRCCM 2013;187: % Successfully Extubated AW PW P= Days to Successful Extubation
20 The Decision to Extubate in the ICU Thille AW, Richard J, Brochard L. AJRCCM 2013;187: Study (Reference) Number of Extubations Rate of Extubation Failure [% (n)] ICU Mortality in Reintubated Patients [% (n)] ICU Mortality in Nonreintubated Patients (%) Esteban et al., 1997 (1) Esteban et al., 1999 (2) Epstein et al., 1997 (4) Vallverdu et al., 1998 (3) Thille et al., 2011 (6) Frutos-Vivar et al., 2011 (14) Funk et al., 2009 (38) Tonnelier et al., 2011 (39) Sellares et al., 2011 (34) Peñuelas et al., 2011 (40). 19 (74) 27 (20) (61) 33 (20) (40) 43 (17) (23) 35 (8) (26) 50 (13) (180) 28 (50) (26) Not available Not available. 10 (12) Not available Not available. 20 (36) Not available Not available. 10 (278) 26 (72) 5 Extubation facts: 10-20% failure rate despite meeting all criteria Associated with a 25-50% mortality rate
21 Extubation & the Myth of Minimal Ventilator Settings Tobin M. Am J Respir Crit Care Med. 2012;185: Tobin still recommends 30 min T-Piece trials Alternative: Flow-by with no PS nor PEEP What you see is what you get: The breathing pattern before extubation (no PS, ZEEP) was the same as after extubation (n=50) Pre-Extubation Post-extubation Respiratory Rate 23.3 (5.3) 24.3 (5.5) Vt (ml) 423 (139) 435 (169) V I (liters) 9.32 (3.26) 9.74 (3.83) % Rib Cage 52.1 (1.6) 51.0 (1.4) Krieger BP, et al. Chest 1988;93:
22 Work of Breathing (WOB) Before & After Extubation from a T-Piece Total WoB Elastic WoB Resistive WoB (n = 16) Strauss C, Lemaire F, Brocahrd L, et al. Contribution of ETT and Upper Airway to Breathing Workload. AJRCCM 1998;157:23-30
23 Pressure Support(PS) vs Trache Collar (TC) in Patients Requiring Prolonged Mechanical Ventilation Jubran A Tobin. JAMA 2013;309: Methods - single LTACH from screened ( ) via 5 day TC trial 316 failed were randomly assigned PS group: PS decreased by 2 at 0800,1400,2000 PS titrated for RR <30; initial PS 14 Once PS 6 reached, trache collar for 5 days TC group TC for up to 12 hrs qd Once 3 successful 12 hr periods reached, TC for 5 days 5 days of TC considered successful wean
24 Pressure Support(PS) vs Trache Collar (TC) in Patients Requiring Prolonged Mechanical Ventilation Jubran A Tobin. JAMA 2013;309: Definition of Weaning Failure Criteria A HR > (220-age) x 0.8 beats/min BP sys < 80 SpO2, 90% Patient request Criteria B RR > 35 BP sys > 180 Agitation Diaphoresis
25 PS vs Trache Collar in LTACH Wean Jubran A Tobin. JAMA 2013;309: % Remaining on MVS
26 Effect of Vent Mode on Sleep Quality in Critically Ill Patients Parthasarathy & Tobin. A J Respir Crit Care Med 2002;166: patients AC with Vt = 8 ml/kg vs CPAP with PS set to achieve 8 ml/kg AC RR 4 below awake RR Sleep fragmentation more in PS (79+/-7) vs AC (54+/-7) P=0.02 CPAP + PS induced more central apneas
27 Sleep Quality in Tracheostomized Patients CPAP/PS (MV) vs T-piece/Trache Collar Roche-Campo, Brochard L, et al. Crit Care Med 2013;41: Single institution study; n=16 No sedation > 48 hrs; able to tolerate T-p or TC > 5 hrs Single night study (5 hrs CPAP + PS and 5 hrs T-p or TC) PS adjusted for RR 25 & Vt 6 ml/kg Results Spontaneous MV p Total Sleep Time 132 mi 183 min 0.04 Stages % 67% 0.36 Stages % 27% 0.57 REM 2% 9% 0.14 Fragmentation 23/hr 25/hr 0.65 Conclusions MV improved sleep duration but not quality Suggest using MV qhs at least in the beginning of weaning
28 Reference textbook of Sleep Disorders Medicine
29 Which ventilatory strategy often worsens the PaO2/FiO2 ratio in patients with ARDS? a) Pressure controlled inverse ratio ventilation b) Prone position c) Vt (6 ml/kg IBW) strategy d) Nitric Oxide e) High-frequency oscillatory jet vent
30 ARDS Network - Outcomes Variable Lower Vt Traditional P value Death 31% 40% No 28 Barotrauma Days with no MSOF Interleukin 6, day 3 66% 55% < % 11% pg/ml 2.3 pg/ml <0.001 NEJM 2000;342:1301-8
31 High-Frequency Ventilation The Ultimate Lung Protective Strategy
32 High Frequency Oscillatory Ventilation No Statistical Effect on Survival HFOV CV MVS P value N Alive off MVS 27 (36%) 23 (31%) Alive on MVS 20 (26%) 12 (16%) Dead 28 (37%) 38 (52%) AJRCCM 2002;166:801-08
33 Hospital or 30 day mortality in patients with acute lung injury/acute respiratory distress syndrome allocated to high frequency oscillation or conventional MVS Sud S et al. BMJ 2010;340:bmj.c2327 (5/18/10) Reviewed 2,995 citations; only 8 met criteria (total n=431) *20% of patients were children* Derdak & Bollen study started HFO in < 2 days * *
34 High-Frequency Oscillation in Early ARDS OSCILLATE Trial Investigators Randomized-controlled trial in 39 ICUs Canada & US > Mexico, Saudi Arabia, India Initial goal: 1200 patients Terminated after interim analysis of 500 patients Methods Increased mortality in HFOV group (47% vs 35%, p=0.005) Goals: PaO2: mmhg; ph > 7.25 Control Vt 6 ml/kg; Pplateau <35; high PEEP 20 Ferguson N et al. N Engl J Med 2013; 363:
35 High-Frequency Oscillation in Early ARDS OSCILLATE Trial Investigators Physiology at Time of Randomization HFOV Controls FiO ph P : F ratio PEEP Mortality- Multivariate Analysis Odds Ratio (95% CI) P-value HFOV Use 1.66 ( ) 0.01 Age 1.42 ( ) <0.001 Acute Physiology Score 1.49 ( ) <0.001 Days Prior to Trial 1.10 ( ) <0.001 Sepsis 1.17 ( ) 0.59
36 Prone Positioning in ARDS Supine Prone mm Hg PaO2/FiO2 Stocker et al. Chest 1997; 111: ; 25 trauma ARDS pts
37 Prone Positioning in ARDS Rationale, Indications, and Limits CT Scans Supine and Prone Gattinoni l, Marini JJ, et al. AJRCCM 2013;188:
38 Prone Positioning in ARDS Rationale, Indications, and Limits Gas/Tissiue by CT scan More homogenous inflation of alveoli Gattinoni l, Marini JJ, et al. AJRCCM 2013;188:
39 Increase in FRC Effects of Prone Positioning volume recruited in the posterior lung (which receives the greatest proportion of perfusion) Regional V & V/Q more uniform diaphragm & chest wall mechanics aided less distortion from heart, mediastinum & diaphragm Dorsal-to-ventral orientation allows better drainage Results in improved oxygenation & possibly reduced incidence of VALI Messerole, Peine, Wittkopp, Marini, Albert. AJRCCM 2002;165:
40 Randomized Prone (>20 hrs/d) vs Supine Trial in ARDS Physiology (p<0.05) Survival (p=0.27) Mancebo J Albert RK. AJRCC 2006;173;
41 Prone - Supine II Study Taccone, et al. JAMA 2009;302: Methods Randomized, multi-institutional study of 342 adults 23 Italian and 2 Spanish ICU s 168 prone for 20 hrs/d; 174 supine Results Mortality at 28 days: 31.0 vs 32.8% RR 0.97; 95% CI ; p=0.72 Mortality at 6 months: 47.0 vs 52.3% RR 0.90; 95% CI ; p=0.33
42 Prone Positioning in Severe Acute Respiratory Distress Syndrome Guerin C, et al for the PROSEVA Study Group (Proning Severe ARDS Patients) N Engl J Med 2013; 368:
43 PROSEVA Study Methods ARDS criteria (after hrs MVS stabilization) PaO2:FiO2<150 with FiO2>0.59 & PEEP >4 Vt ~6ml/kg IBW 26 French ICUs and 1 in Spain Prone group turned within I hr of randomization > 16 hrs prone, then supine for up to 4 hrs Criteria to stop prone position (met for 4 hrs supine) P:F ratio>149 with PEEP<11 & FiO2<0.61 Daily trials continued for up to 28 days
44 PROSEVA Trial Parameters at the Time of Inclusion in Study N Engl J Med 2013; 368:
45 PROSEVA Trial Cumulative Probability of Survival N Engl J Med 2013; 368:
46 PROSEVA Study Why It Was So Successful PROSEVAS Trial Previous Prone Trials
47 PROSEVA Study Why It Was So Successful Avoided pitfalls of previous ARDS studies Used as a preventative strategy, not as salvage mode Started within 36 hours of ARDS Used only in the most severe ARDS patients Control group was amazingly well-matched Almost too good to be real Control group MVS well done (low Vt strategy) Putting study in perspective of clinical ICUs Each ICU averaged 6.7 eligible ARDS patients / year Each ICU averaged 49 ARDS patients / year Conclusions: Use It Early in Only the Most Severe
48 Honorable Mention 1) Demoule A, et al. Diaphragm dysfunction on admission to the ICU. Prevalence, risk factors, and prognostic impact-a prospective study. Am J Respir Crit Care Med 2013;188: ) Futier E,et al for the IMPROVE study group. A trial of intraop erative low Vt in abdominal surgery. NEJM 2013;369: ) Gilstrap & MacIntyre. Patient-ventilator interactions. Implications for clinical management. Am J Respir Crit Care Med 2013;188: ) Jaaly A et al. Effect of adding postoperative NIPPV to usual care to prevent pulmonary complications in patients undergoing coronary artery bypass grafting: a randomized controlled trial. J Thorac Cardiovasc Surg 2013;146: ) Point/Counterpoint Editorials. Hall J vs Sessler C. Should paralytic agents be routinely used in severe ARDS? Chest 2013;144:
49 Preventative Medicine
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